a: x/147=5/7
=>x=147*5/7=105
b: x-2/36=7/12
=>x-2/36=21/36
=>x=21/36+2/36=23/36
a: x/147=5/7
=>x=147*5/7=105
b: x-2/36=7/12
=>x-2/36=21/36
=>x=21/36+2/36=23/36
Tình nhanh
a) 18x 76 +24x -150
b) 147+230+53+70
c) 7x 85+27 x 7-7 x 12
D) 2va3/5 -2/5x( 5/8-7/12)
Tích sau có tận cùng bằng bao nhiêu chữ số 0
a, 36 x 37 x 38 x...x 76 x 77
b,5 x 7 x 12 x 15 x 16 x 25 x 35 x 55 x 75
c, 147 x 148 x 149 x...x 317
a,6/15=8/y
b,x/5=6/10
c,2/3=12/x
d,24/26=x/12
e,14/56=1/x
g,x/125=2/2
h,6+x/33=7/11
i,5/7=y/147
k,5/7=y/147
l,4/x=y/21=28/49
m,3*x-5/60=2/3
n,2/3*x=3*9
o,24/120=x/5
Bài : Tìm x thuộc Z , biết :
a) 15 - 5. | x+4 | =-12 - 3
b) ( 4x - 8) . ( 7-x ) = 0
c) ( x^2 - 36) x ( x^2 + 5 ) =0
d) -3. ( x+7) -11 = 2.(x +5)
2 | + | 2 | + … + | 2 | = | |
5 x 7 | 7 x 9 | 145 x 147 |
|
Tính
a. 7,2 : 2 x 58,6 + 2,93 x 2 x 64
b. 4/2/5 + 2/3/7 - 2/2/5 + 5/4/7 (hỗn số)
c. 2 x 41 x 36 +8 x 9 x 58 + 12 x 6
d. 3/5 x 1/2 : 2/5
e . 1/1/3 x 4/7 + 1/1/3 x 3/7
AI BIẾT THÌ GIÚP MIK NHÉ !
2 x 6 = .....; 3 x 4 = .....; 4 x 9 = .....; 5 x 8 = .....?
A. 8; 7; 13; 13
B. 12; 12; 36; 40
C. 11; 13; 35; 41
D. 12; 12; 38; 30
Thuc hien phep tinh bang cach tinh nhanh :
a) 4/9 + 3/2 + 6/36.
b) 2/7 x 5/17 + 12/7 x 15/17.
c) 2,34 + 5,18 + 7,66.
d) 7/11 : 3/4 + 7/11 : 1/4.
GIUP MINH MINH DANG CAN GAP.
Tính Nhanh:
a) 5/12*4/9+4/9*7/12 b) (13/21*7/8-12/21*7/8)*12 c) 7/11+3/4+4/11+8/17+1/4+18/34
Tìm x:
a) 3,71+(632-x)=415
b) 140:(5*x-15)=4
c) 84:(324:18+36-x)+15=19